diff --git a/apps/daemon/src/runtimes/defs/codex.ts b/apps/daemon/src/runtimes/defs/codex.ts
index f13b2318b..23ada6158 100644
--- a/apps/daemon/src/runtimes/defs/codex.ts
+++ b/apps/daemon/src/runtimes/defs/codex.ts
@@ -48,6 +48,10 @@ export function codexNeedsDangerFullAccessSandbox(
   platform: NodeJS.Platform = process.platform,
   env: NodeJS.ProcessEnv = process.env,
 ): boolean {
+  // Operator override for deployments where Codex cannot create its
+  // workspace-write sandbox, for example unprivileged Linux containers.
+  // Only danger-full-access is accepted; unknown values keep the default path.
+  if (env.OD_CODEX_SANDBOX?.trim() === 'danger-full-access') return true;
   if (platform === 'win32') return true;
   // WSL reports `linux` but Codex still hits the Windows read-only
   // workspace-write sandbox path when launched from there (#2834).
diff --git a/apps/daemon/tests/runtimes/registry-and-args.test.ts b/apps/daemon/tests/runtimes/registry-and-args.test.ts
index e47d08080..25817e1fe 100644
--- a/apps/daemon/tests/runtimes/registry-and-args.test.ts
+++ b/apps/daemon/tests/runtimes/registry-and-args.test.ts
@@ -103,33 +103,37 @@ test('local agent profiles skip explicit unknown baseAgent without falling back'
 });
 
 test('codex args disable plugins when OD_CODEX_DISABLE_PLUGINS is 1', () => {
-  process.env.OD_CODEX_DISABLE_PLUGINS = '1';
+  withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX'], () => {
+    process.env.OD_CODEX_DISABLE_PLUGINS = '1';
+    delete process.env.OD_CODEX_SANDBOX;
 
-  withPlatform('darwin', () => {
-    const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
+    withPlatform('darwin', () => {
+      const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
 
-    assert.deepEqual(args.slice(0, 11), [
-      'exec',
-      '--json',
-      '--skip-git-repo-check',
-      '--sandbox',
-      'workspace-write',
-      '-c',
-      'sandbox_workspace_write.network_access=true',
-      '-c',
-      'default_permissions=":workspace"',
-      '--disable',
-      'plugins',
-    ]);
+      assert.deepEqual(args.slice(0, 11), [
+        'exec',
+        '--json',
+        '--skip-git-repo-check',
+        '--sandbox',
+        'workspace-write',
+        '-c',
+        'sandbox_workspace_write.network_access=true',
+        '-c',
+        'default_permissions=":workspace"',
+        '--disable',
+        'plugins',
+      ]);
+    });
   });
 });
 
 test('codex args use workspace-write sandbox on macOS and Linux', () => {
-  delete process.env.OD_CODEX_DISABLE_PLUGINS;
+  withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX', 'WSL_DISTRO_NAME'], () => {
+    delete process.env.OD_CODEX_DISABLE_PLUGINS;
+    delete process.env.OD_CODEX_SANDBOX;
 
-  for (const platform of ['darwin', 'linux'] as const) {
-    withPlatform(platform, () => {
-      withEnvSnapshot(['WSL_DISTRO_NAME'], () => {
+    for (const platform of ['darwin', 'linux'] as const) {
+      withPlatform(platform, () => {
         delete process.env.WSL_DISTRO_NAME;
         const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
         assert.equal(args.includes('--full-auto'), false);
@@ -149,15 +153,15 @@ test('codex args use workspace-write sandbox on macOS and Linux', () => {
           true,
         );
       });
-    });
-  }
+    }
+  });
 });
 
 test('codex args use danger-full-access sandbox on WSL because workspace-write stays read-only', () => {
-  delete process.env.OD_CODEX_DISABLE_PLUGINS;
-
   withPlatform('linux', () => {
-    withEnvSnapshot(['WSL_DISTRO_NAME'], () => {
+    withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX', 'WSL_DISTRO_NAME'], () => {
+      delete process.env.OD_CODEX_DISABLE_PLUGINS;
+      delete process.env.OD_CODEX_SANDBOX;
       process.env.WSL_DISTRO_NAME = 'Ubuntu';
       assert.equal(codexNeedsDangerFullAccessSandbox('linux', process.env), true);
       const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
@@ -173,6 +177,50 @@ test('codex args use danger-full-access sandbox on WSL because workspace-write s
   });
 });
 
+test('codex args allow OD_CODEX_SANDBOX danger-full-access override on Linux', () => {
+  withPlatform('linux', () => {
+    withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX', 'WSL_DISTRO_NAME'], () => {
+      delete process.env.OD_CODEX_DISABLE_PLUGINS;
+      process.env.OD_CODEX_SANDBOX = 'danger-full-access';
+      delete process.env.WSL_DISTRO_NAME;
+
+      assert.equal(codexNeedsDangerFullAccessSandbox('linux', process.env), true);
+      const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
+      assert.deepEqual(args.slice(0, 5), [
+        'exec',
+        '--json',
+        '--skip-git-repo-check',
+        '--sandbox',
+        'danger-full-access',
+      ]);
+      assert.equal(
+        args.includes('sandbox_workspace_write.network_access=true'),
+        false,
+      );
+    });
+  });
+});
+
+test('codex args ignore unknown OD_CODEX_SANDBOX values', () => {
+  withPlatform('linux', () => {
+    withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX', 'WSL_DISTRO_NAME'], () => {
+      delete process.env.OD_CODEX_DISABLE_PLUGINS;
+      process.env.OD_CODEX_SANDBOX = 'workspace-write';
+      delete process.env.WSL_DISTRO_NAME;
+
+      assert.equal(codexNeedsDangerFullAccessSandbox('linux', process.env), false);
+      const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
+      assert.deepEqual(args.slice(0, 5), [
+        'exec',
+        '--json',
+        '--skip-git-repo-check',
+        '--sandbox',
+        'workspace-write',
+      ]);
+    });
+  });
+});
+
 test('codex args use danger-full-access sandbox on Windows because workspace-write blocks PowerShell', () => {
   // Codex CLI's workspace-write sandbox mode on Windows lacks a working
   // OS-level sandbox and falls back to a policy that rejects shell
@@ -180,48 +228,57 @@ test('codex args use danger-full-access sandbox on Windows because workspace-wri
   // The agent cannot list files or run any shell-backed tool under that
   // policy. danger-full-access is Codex CLI's documented Windows-compatible
   // mode (issue #1721).
-  delete process.env.OD_CODEX_DISABLE_PLUGINS;
+  withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX'], () => {
+    delete process.env.OD_CODEX_DISABLE_PLUGINS;
+    delete process.env.OD_CODEX_SANDBOX;
 
-  withPlatform('win32', () => {
-    const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
+    withPlatform('win32', () => {
+      const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
 
-    assert.deepEqual(args.slice(0, 5), [
-      'exec',
-      '--json',
-      '--skip-git-repo-check',
-      '--sandbox',
-      'danger-full-access',
-    ]);
-    // The workspace-write-scoped network override is meaningless under
-    // danger-full-access and must not appear on Windows.
-    assert.equal(args.includes('workspace-write'), false);
-    assert.equal(
-      args.includes('sandbox_workspace_write.network_access=true'),
-      false,
-    );
-    assert.equal(args.includes('default_permissions=":workspace"'), true);
+      assert.deepEqual(args.slice(0, 5), [
+        'exec',
+        '--json',
+        '--skip-git-repo-check',
+        '--sandbox',
+        'danger-full-access',
+      ]);
+      // The workspace-write-scoped network override is meaningless under
+      // danger-full-access and must not appear on Windows.
+      assert.equal(args.includes('workspace-write'), false);
+      assert.equal(
+        args.includes('sandbox_workspace_write.network_access=true'),
+        false,
+      );
+      assert.equal(args.includes('default_permissions=":workspace"'), true);
+    });
   });
 });
 
 test('codex args keep plugins enabled when OD_CODEX_DISABLE_PLUGINS is unset', () => {
-  delete process.env.OD_CODEX_DISABLE_PLUGINS;
+  withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX'], () => {
+    delete process.env.OD_CODEX_DISABLE_PLUGINS;
+    delete process.env.OD_CODEX_SANDBOX;
 
-  withPlatform('darwin', () => {
-    const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
+    withPlatform('darwin', () => {
+      const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
 
-    assert.equal(args.includes('--disable'), false);
-    assert.equal(args.includes('plugins'), false);
+      assert.equal(args.includes('--disable'), false);
+      assert.equal(args.includes('plugins'), false);
+    });
   });
 });
 
 test('codex args keep plugins enabled when OD_CODEX_DISABLE_PLUGINS is not 1', () => {
-  process.env.OD_CODEX_DISABLE_PLUGINS = 'true';
+  withEnvSnapshot(['OD_CODEX_DISABLE_PLUGINS', 'OD_CODEX_SANDBOX'], () => {
+    process.env.OD_CODEX_DISABLE_PLUGINS = 'true';
+    delete process.env.OD_CODEX_SANDBOX;
 
-  withPlatform('darwin', () => {
-    const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
+    withPlatform('darwin', () => {
+      const args = codex.buildArgs('', [], [], {}, { cwd: '/tmp/od-project' });
 
-    assert.equal(args.includes('--disable'), false);
-    assert.equal(args.includes('plugins'), false);
+      assert.equal(args.includes('--disable'), false);
+      assert.equal(args.includes('plugins'), false);
+    });
   });
 });
 
diff --git a/deploy/.env.example b/deploy/.env.example
index 788be0ce8..978ac3f29 100644
--- a/deploy/.env.example
+++ b/deploy/.env.example
@@ -22,3 +22,6 @@ OPEN_DESIGN_MEM_LIMIT=384m
 # Node.js heap cap inside the container.
 NODE_OPTIONS=--max-old-space-size=192
 
+# Optional Codex CLI sandbox override. Set to danger-full-access only when
+# Codex fails with workspace-write sandbox setup errors inside the container.
+OD_CODEX_SANDBOX=
diff --git a/deploy/README.md b/deploy/README.md
index 1983779b7..844a87c24 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -58,6 +58,20 @@ The image intentionally does not bundle Claude/Codex/Gemini CLI binaries. Keep
 those outside the image, or build a separate private runtime layer if a server
 deployment needs local code-agent CLIs installed in the container.
 
+If you install Codex inside an unprivileged Linux container and it fails while
+creating its `workspace-write` sandbox, opt into Codex's full-access mode for
+all Codex runs in that deployment:
+
+```bash
+OD_CODEX_SANDBOX=danger-full-access docker compose up -d --no-build
+```
+
+Only the exact value `danger-full-access` is supported; unknown values are
+ignored. Use this only for trusted, single-user deployments. It lets Codex run
+without the workspace-write sandbox, which is useful when the container host
+blocks unprivileged user namespaces, but it gives the Codex process broader
+filesystem access inside the container.
+
 ## Publish to Docker Hub
 
 ```bash
diff --git a/deploy/docker-compose.yml b/deploy/docker-compose.yml
index c999cd873..f786dbd7a 100644
--- a/deploy/docker-compose.yml
+++ b/deploy/docker-compose.yml
@@ -16,6 +16,7 @@ services:
       OD_PORT: 7456
       OD_WEB_PORT: ${OPEN_DESIGN_PORT:-7456}
       OD_API_TOKEN: ${OD_API_TOKEN:?Please run 'openssl rand -hex 32' to generate one, and set it in your .env file.}
+      OD_CODEX_SANDBOX: ${OD_CODEX_SANDBOX:-}
     ports:
       - "127.0.0.1:${OPEN_DESIGN_PORT:-7456}:7456"
     volumes: